2005 expedition oil gauge is going hot what does that mean

You do not have a timing belt- you have a chain

If the shop put in the problems, wouldn't you go back there?

Permanent air lock means your system has leak sum were or your reserve tank and radiator cup not function propebly full radiator fit cup Rev engine up to 1500to 2000 few times stop engine and top up sum time take 10 times.

If you mean the low pressure warning on the cluster, is the oil pressure dropping below normal range ?
You may need to have the oil pressure sensor replaced or have the oil pressure checked with a mechanical gauge.

Low oil pressure is a serious problem and should be checked right away. Either the oil pressure sending unit is sending the wrong pressure, or the oil pressure is too low due to an engine problem. A shop will be able to verify the actual oil pressure with a mechanical gauge. If the pressure is really okay, they can then change the sender or look for a faulty oil pressure gauge. If the pressure is really low, meaning that the sender was correct, the cause for the low pressure must be dealt with before expensive engine damage occurs.

Possible causes for low oil pressure include: wrong grade or weight of oil used, clogged oil filter, clogged oil pick-up strainer, engine running too hot, oil pump worn or damaged, idle speed too low, and oil pressure gauge working improperly.

It is doubtful that the oil pressure and the speaker problems are related. Engine controls and indicators and body accessories are generally on completely separate electrical circuits.

No heat usually means low water level in radiator. Check your plastic surge tank to see if is at the proper level. When engine is cool check actual level in radiator.

For smell check to see if any oil is weeping from top engine gasket and dripping onto exhaust manifold, You should be able to check with flashlight while engine is idling.

no,,, fluctuations mean =low oil pressure,oil level low,oil old or too thin viscotly,oil pump loosing or not develloping the correct pressure
pressure release valve spring weakened

Sometimes a bad battery connection will cause gauges go hay wired. Turn your switch on but not over and see if your gauges do the same without the car running. try loosening the battery cables and reposition the post.

Mud like stuff? You mean oil like stuff? Is it white and greasy looking? This is not good. Check your oil for water, sounds like you have a head gasket going. Look for steam out the exhaust after it warms up. Drip some oil off the dipstick onto the hot exhaust and see if it sizzles, (water) oil will just smoke. Keep an eye on the temp gauge. Don't let it overheat. And shut it down if it does. A radiator shop can tell you if you have lost compression. Hope this helps.

Possibilities -

1. Failing oil pump
2. Engine sludge
3. Overfilled oil

It's overheating.  check thermostat and water pump, also radiator coolant levels.  once you get it running at normal temp again take it to the shop and have them do a chemical test to see if the head gasket was damaged or the block was warped or cracked as this usually happens when your car overheats.